上述的對Apache虛擬主機的配置過程,主要在於三個部分:Apache,launcher,pvw,主要的配置在前面,通過Apache來分發用戶,通過launcher來爲用戶啓動pvw的進程。
我的理解:給Apache配置虛擬主機是爲了把Apache當做一個虛擬的主機供用戶訪問,用戶直接訪問的是Apache,但實際上是通過Apache來訪問pvw,該虛擬主機訪問鏈接是:http://localhost:port;launcher.conf中配置了真正要訪問的主機的sessionURL,虛擬主機中設定一種重寫規則,通過這個規則去匹配launcher.conf,當用戶訪問的時候,虛擬主機爲用戶設定一個id用於區分不用用戶,並且記錄在proxy.txt中,然後去launcher.conf中匹配,從設定好的端口範圍中選取一個,以這個ws://${host}/proxy?sessionId=${id}組合成的sessionURL去訪問pvw,從而爲該用戶啓動一個後臺的程序;Apache分發的不同用戶通過proxy.txt與launcher進行匹配,從而保證了不同用戶請求與響應的分離。
官網上有兩種方式來配置,一種是Apache與launcher在一臺主機上,另外一種是這兩部分放在不同的主機上,通過配置文件的比較,發現配置文件區別不是很大,只是在於launcher.conf中對host的設置,另外有一個jetty launcher,沒用到,所以沒仔細看。配置文件粘貼如下,官網網址點擊打開鏈接。
在一臺主機上Apache虛擬主機:
<VirtualHost *:80>
ServerName host1.example.com
...
# Handle launcher forwarding
ProxyPass /paraview http://localhost:8080/paraview
# Handle WebSocket forwarding
RewriteEngine On
RewriteMap session-to-port txt:<MAPPING-FILE-DIR>/proxy.txt
RewriteCond %{QUERY_STRING} ^sessionId=(.*)$ [NC]
RewriteRule ^/proxy.*$ ws://${session-to-port:%1}/ws [P]
</VirtualHost>
在一臺主機上launcher.conf:
{
"resources": [ {"host": "localhost", "port_range": [9001, 9003] } ],
...
"configuration": {
"host": "localhost",
"port": 8080,
"sessionURL": "ws://host1.example.com/proxy?sessionId=${id}",
"proxy_file": "<MAPPING-FILE-DIR>/proxy.txt"
},
...
"apps": {
...,
"visualizer": {
"cmd": [
"${python_exec}", "${python_path}/paraview/web/pv_web_visualizer.py",
"--port", "${port}", "--data-dir", "${dataDir}", "-f", "--authKey", "${secret}"
],
"ready_line" : "Starting factory"
},
...
}
}
在兩臺主機上Apache虛擬主機:
<VirtualHost *:80>
ServerName host1.example.com
...
# Handle launcher forwarding
ProxyPass /paraview http://host2.example.com:8080/paraview
# Handle WebSocket forwarding
RewriteEngine On
RewriteMap session-to-port txt:<MAPPING-FILE-DIR>/proxy.txt
RewriteCond %{QUERY_STRING} ^sessionId=(.*)$ [NC]
RewriteRule ^/proxy.*$ ws://${session-to-port:%1}/ws [P]
</VirtualHost>
在兩臺主機上launcher.conf:
{
"resources": [ {"host": "host2.example.com", "port_range": [9001, 9003] } ],
...
"configuration": {
"host": "localhost",
"port": 8080,
"sessionURL": "ws://${host}/proxy?sessionId=${id}",
"proxy_file": "<MAPPING-FILE-DIR>/proxy.txt"
},
...
"apps": {
...,
"visualizer": {
"cmd": [
"${python_exec}", "${python_path}/paraview/web/pv_web_visualizer.py",
"--port", "${port}", "--data-dir", "${dataDir}", "-f", "--authKey", "${secret}"
],
"ready_line" : "Starting factory"
},
...
}
}